A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8 m/s2, what is the magnitude of the force on the rider by the sled?
A. 0.83 kN
B. 0.98 kN
C. 0.65 kN
D. 0.68 kN
E. 0.72 kN
Answer: C
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